Dumping grate



C. WFG

DUMPING GRATE Filed March l5, 1928 3? Sheets-Sheet a y v C. WARG DUMPING GRTE Smeets-Sheet 3 Filed March l5,

Patented June 4, 1935 UNITED STATESv 2,003,729 nUMrING GRATE' Charles A. Warg,. Scranton/Pa., assignor to McClave-Brooks Company, Scranton, Pa., a ycorporation of Pennsylvania.

Application March 13, 1928*, Serial No. 261,361

11 Claims. (Cl. 30824) A .Thepresent invention relates tofurnace grates and has for its principal object the provision of a simple and` eicient dumping grate suitable for high or low pressure heating installations.

The invention provides certain improvements ln a. grate of this type which lower the cost of production, improve the operating efficiency, and facilitate the replacement of worn and broken parts.A `One improvement effected by the invention resides in providing the grate bar journals with, detachable journal sleeves vwhich present large bearing surfaces and which can easily be replaced' when worn or fractured. Another improvementisin the stationary grate bar bearings, and consistsV in making the usual part bearings detachable so that they can easily be replaced when necessary and in providing cap plugs which function both to hold the grate bar journals and to lock the bearings in place. The invention also provides an improved mounting of the tops on the grate bars, this improvement'eliminating the necessity of cored bars, which are comparatively expensive to manufacture. Other improvements effected by the invention are recited more fully in the claims.

Referring to the accompanying drawings:

Figure 1 is a vertical longitudinal section through a grateembodying the invention;

Figure 2 is a plan view of the front part of the grate, showing one row of the grate bar tops in horizontal section;

Figure 3 is a side elevation of one end of the journal bearing bar vor carrier bar;

Figures 4, 5 and 6 are, respectively, a plan, a side elevation, and an rend View of one of the grate bars; Y

' Figure 7 is a sectional view on line 1--1 of Figure 3; Y

Figures 8, 9 and 10 are, respectively, a top, an end, and a side View of a replaceable journal bearing; and I Figure 1l is a transverse sectional view of a pair of grate bar tops. l

The carrier bars 20, which are of ltruss form, carry the journal bearings of the several grate bars, and are supported on' front `and rear plates 2l and`22, the latter or back bearerI being set in the rear wall of the furnace and the former being secured to the metal front 23 and supporting the fire brick 24. vThe grate frame is completed by a front frame end 25 which is interlocked with the carrier bars by the engagement of dove-tail tenons 26 at the ends of the front frame end or 1 55' barin correspondingly shaped .slots in the carrier bars, and by a rear frame end 21 having a similar connection with the carrier bars 20.

The grate has from two to ten grate bars 28,

each supporting a number of independently removable tops 29, the top at one side being shown as of fractional width. As shown in Figures 4, 5 and 6, the journals 30 of these grate bars are removable, each journal consisting of a short sleeve fitting over a trunnion 3| which is preferably integral with the grate bar. Inorder lto prevent rotary movement of the sleeve Withre-lspect to the trunnion the sleeve is formed with a non-circular, or flattened, portion30a which' engages With a flattened portion 3| a of the trunnion, and to prevent endwise or lateral movement of the sleeve, the trunnion or pintle is formed with a depression or groove, 3 l b, which is engaged by the end of a pin 32 driven through a radial hole in the sleeve. y Y

The grate'bar journals are mounted replaceable bearings 33 set in upwardly 4opening slots 34 formed in the side of carrier bars '20. These bearings are adapted to be slipped rinto the slots and are formed to have a snug t'with the lower portions thereof, and they' are held from lateral displacement by means of opposed ver'- tical ribs 35 projecting Ainwardly from "the side walls of the slots and engaging central grooves 36 in the two sides of the bearings 33.

The journals as well as the bearings are held in operative positions by means of sectional' lock: ing caps, each formed of twointerlocking wedgeshaped plugs 31 and 38. The inner smaller ends of these cap pieces or plugs are vertically slotted, or bifurcated, so as to seat in inclined vtapered recesses 39 formed in the inner and outer faces of side bars 20 and opening into slots 34. In mounting the grate bars, the bearings 33 are first snugly seated in the slots 3.4 and the grate bar journals 30-3I are then seated in the two bearings. The cap plugs 38 are now inserted and are then locked by the cap plugs 3l. When thus placed the tops of these'plugsare flush with the top of the side or carrier 'bars 20 and form therewith a substantially continuous surface. It will be observed that the top edges of the journal bearings 33 are at such an angle so that when a bearing is seated its inclined edges are in alignment with the bottom walls of slots-39, consequently when the cap plugs are inserted in properA position their lower sides engagethe yinclined edges of the bearings and securely lock the 'bearing foreach edge of the bearing 33 vis at'right angles to the far wall of the opposite plug. These cap plugs therefore perform the double function its'y of holding the grate bar journals from vertical displacement and locking the removable journal bearings.

The grate bar 28 is a rectangular hollow casting of the construction clearly shown in Figures 4 and 5. The bar is open at the top and bottom and closed at the ends, and is divided into four sections by partition walls 40, each section being adapted to seat one of the four tops. The bar is provided with opposed ribs 40a, which project inwardly from the sides of the bar in pairs at points midway between the partitions 4U to posi tion the central web of the top. Formed integrally with each grate bar is the usual depending lug 4| having a laterally projecting pin 42 for attachment to the connecting bar; the bar per se is claimed in my copending application Serial No. 751,618, led November 5, 1934., In Athe grate illustrated the two rear grate bars are adapted to be rocked together, while the two front bars are also adapted to be rocked together, but independently of the two rear bars, that is the front and rear sections of the grate are adapted to be dumped independently. The depending lugs 4I of the two rear bars are therefore joined by a connecting bar 43, while the depending lugs of the two front bars are connected by a quite similar bar 44. The bars 43 and 44 are respectively attached to connecting rods 45 and 46, which extend through apertures vin the metal front 23 of the furnace and are pivoted at their outer ends to twin stub levers 41 which are fulcrumed at 48 to the outer ends of links 49, andare operated by a socketed handle 41a the inner ends of said links 49 being pivoted to fulcrum jaws 50 projecting from the metal front 23. j

The grate bar tops 29 are best illustrated in Figures 2 and 11. Each top is of familiar elongated rectangular form having beveled ends which are adapted to overlap and be overlapped respectively by the ends of adjacent tops, and the sides of the tops may be rabbeted in the smaller mesh sides, as shown in Figure 11, so that adjacent tops on the same bar overlap, this construction preventing sifting between the sides of the tops as well as between the ends of the tops. y Each top is formed with a central downwardly projecting web 50, so that the shank has in horizontal section the form of an I beam, as clearly shown in Figure 2. This side flanged shank projects down through the space in the hollow grate bar defined by adjacent partitions 40, or between the end Walls of the bar and the partition adjacent thereto, the central web 50 of the depending socket piece orV shank entering between opposite kribs 40a, The tops are held in position by means of split pins 5| which are driven through slots 52 in ears or tabs 53 extending from the bottom edge of web 50, these pins bridging the lower edges ofthe side walls of the grate bar and thus securely holding the tops on the bar.` It lwill be observed that this method of mounting the tops on the bars does not require any coring of the bars nor any appreciable machine work on the bars or tops, the construction of these parts being therefore rendered simple and economical while at the same time the construction is as durable and as efficient as the more expensive constructions heretofore employed.

n What I claim is: 'n 1. In a dumping grate,'a frame including side bars formed with a plurality of spaced upwardly opening recesses, a removable bearing seated in each of said recesses and adapted to receive' a grate bar journal, said side bars being formed with a pair of oppositely inclined slots at the sides of each recess, and a pair of cap plugs mounted in said slots adapted to hold the grate bar journal and also engaging the bearing and locking it in position.

2. In a dumping grate, a frame including side bars formed with spaced upwardly opening recesses, a removable part bearing seated in each of said recesses adapted to receive a grate bar journal', said bearings and recesses having interlock- A`ing portions preventing lateral displacement of the bearings, said bars being formed with a pair of oppositely inclined slots at the sides of said recesses and said part bearings having inclined upper edges which are in alignment with the bottom walls of said recesses respectively when the bearings are seated, cap plugs in said slots en- .gaging said inclined edges to hold the bearing against vertical displacement.

3. In a'dumping grate, a frame including side bars formedwith spaced upwardly opening recesses, a removable part bearing seated in each of said recesses adapted to receive a grate bar journal, said bearings having vertical grooves and the walls of said recesses having ribs engaging said grooves to prevent lateral displacement of the bearings, said side bars being formed lwith a pair of oppositely inclined slots at the sides oi.' each recess, and said part bearings having inclined upper edges which are in alignment with the bottom walls of said recesses respectively when the bearing is seated, and cap plugs in said slots engaging said inclined edges to hold the bearing Vagainst vertical displacement.

4. Ina grate, a'pair of carrier bars each having a journal bearing slot anda journal locking plug slot aty each side. communicating with the journal bearing slot, a replaceable journalbearing in its slot, said bearing having slopingtop walls, each top wall being substantially normal to the distant edge of the opposite slot, and a plug in each plug slot engaging one of the top walls of the bearing to lock it in place.

5. In a grate, a grate bar having atrunnion, a carrier bar having a detachable bearing, a pair of plugs, and detachable means engaging the bearing, both plugs, and said trunnion to pivotally support the grate bar in the carrier bar.

6. The device of claim 5 in which the bearing and the plugs are each provided with means for preventing lateral movement with respect to the carrier bar.

7. The device of claim 5 in which means are provided to prevent relative lateral movement between the grate bar and the detachable means.

8. In a grate, a grate bar formed with an integral pintle projecting from each end, a sleeve adapted to engage non-rotatively each pintle in order to form a journal whereby when the grate bar is in use the wear will be on the outside of the journal sleeve and not upon the pintle or any portion of the grate bar in order that when the journal of the grate bar wears in its bearing in the side bar of the grate frame the journal sleeves can be replaced.

9. 'Ihe device of claim 8 in which the pintles and journal sleeves are formed with part of their engaging surfaces fiat in order to prevent relative rotation of the pintle and sleeve.

10. The device of claim 8 in which the pintles and sleeves have iiat engaging surfaces, the pintles each having a recess on its lower side and the sleeves having radial holes registering with the said recesses and pins in said holes with their inner ends engaging said recesses and their outer ends engaging the supporting surface when said grate bar is in operative position.

l1. In a dumping grate a grate bar adapted to be received rotatably in bearings in the side 5 bars of the frame of a grate characterized by the provision of removable journals rocking with the grate bar and turning in the bearings, whereby when the t between the journal and the bearing becomes too loose proper t can be secured by replacing the journal.

CHARLES A. WARG. 

